Which Transmission Modes to Use: A Quick Introductory Guide

Transmission modes mean how data is transferred from one place to another place. The data that is transferring from one place to another, is colliding with any other type of data. If the cable doesn’t contain more than one channel in it. Then, there is 100% of possibility that it will collide with the remote site device’s data. If the cable contains more than one channel. So, it means that data will travel in the cable facing any collision with the data.

Types of Transmission Modes

There are three types of transmission modes, which are below:

  1. Simplex
  2. Half duplex        
  3. Duplex


The data in simplex mode is traveling in only one direction. Just like our computer keyboard, when we press any key on the keyboard, then we don’t see any output on the keyboard. But, when we input the data to the computer. The keyboard task is to send the data in only one direction, and the direction is towards the computer system unit or CPU. Other examples are keyboard, mouse, joystick, TV transmissions, radio transmissions, etc.

Half Duplex

In half duplex, data will travels in both direction, but it will travel in only one direction across the medium. The sender and receiver can’t send data simultaneously. If sender and reciever will send data at the same time, then the data will collide with each other, and thus they will send it again, but one at a time, e.g walki talki set, computer network hub.


Both sender and receiver can send data in both directions simultaneously e.g. mobile phones, networking devices like switches, routers, firewalls, computers, etc.

            When any two persons talking at mobile phone then both the persons talking at the same time and no collision of voices is occurring. Other examples of Full Duplex are video calls, video conferencing, live chat, etc.

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